NDLI: Expanding Coverage Range and Control Channel Capacity of Co-Channel LTE Small Cells by Using PDCCH Orthogonalization

Content Provider	IEEE Xplore Digital Library
Author	Kucera, S. Lopez-Perez, D.
Copyright Year	2014
Description	Author affiliation: Bell Labs., Alcatel-Lucent, Dublin, Ireland (Kucera, S.; Lopez-Perez, D.)
Abstract	In heterogeneous cellular networks (HetNets) for mobile communications, small cells are deployed within the coverage range of primary macro cells to provide for a localized capacity boost in traffic hotspots. The sharing of communication channels among the macro-cell and the small-cell tiers is spectrally efficient but causes failures of control signaling in LTE networks due to unmitigated co-channel interference. Consequently, the small-cell coverage range and control channel capacity is reduced. The present study explores to what extent the control channel bottleneck in inter-tier co-existence can be eliminated by using orthogonalized scheduling of the user-specific physical downlink control channels (PDCCH). Implementation-wise, the optimization of PDCCH scheduling is closely related to the management of the cell radio network temporary identifiers (C-RNTIs) as these determine the PDCCH resource allocation. Simulations of a 3GPP-compliant HetNet in a Dublin scenario show that the small-cell size can be doubled for a better macro-cell traffic offload by trading the number of active PDCCHs for a higher small-cell expansion bias. Alternatively, the small-cell PDCCH capacity can be tripled for high-load applications such as Voice over LTE by using macro-cell PDCCH muting.
Starting Page	1
Ending Page	5
File Size	179400
Page Count	5
File Format	PDF
ISBN	9781479944491
DOI	10.1109/VTCFall.2014.6965975
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-14
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Signal to noise ratio Vectors Base stations Downlink PD control Standards
Content Type	Text
Resource Type	Article

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